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Vulnerabilities

Vulnerability · CVE-2026-42512

As dhclient is building an environment to pass to dhclient-script, it may need to resize the array of string pointers.

Published Apr 30, 2026 · catalog updated Jun 17, 2026 · As dhclient is building

Check if you run it

No confirmed exploitation is on record for CVE-2026-42512. EPSS is 1.81%. Act only if a listed version of As dhclient is building is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (As dhclient is building).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.81%
Remediation
Advisory link
Affected products
cpe freebsd/freebsd

As dhclient is building an environment to pass to dhclient-script, it may need to resize the array of string pointers. The code which expands the array incorrectly calculates its new size when requesting memory, resulting in a heap buffer overrun. A specially crafted packet can cause dhclient to overrun its buffer of environment entries. This can result in a crash, but it may be possible to leverage this bug to achieve remote code execution.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe freebsd/freebsd13.5

How to fix CVE-2026-42512

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-42512. EPSS is 1.81%. Act only if a listed version of As dhclient is building is installed.

Which versions are affected?

Compare what you have installed with 13.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-122: Heap-based Buffer Overflow. EPSS 1.81%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 30, 2026 · NIST NVD

    Detected

    As dhclient is building an environment to pass to dhclient-script, it may need to resize the array of string pointers. The code which expands the array incorrectly calculates its new size when requesting memory, resulting in a heap buffer overrun. A specially crafted packet can cause dhclient to overrun its buffer of environment entries. This can result in a crash, but it may be possible to levera

  2. Jun 17, 2026 · NIST NVD

    Updated

    As dhclient is building an environment to pass to dhclient-script, it may need to resize the array of string pointers. The code which expands the array incorrectly calculates its new size when requesting memory, resulting in a heap buffer overrun. A specially crafted packet can cause dhclient to overrun its buffer of environment entries. This can result in a crash, but it may be possible to levera

Sources

  • CVE.orgVulnerability recordCVE-2026-42512

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-42512

    30-day exploitation probability 1.8%

    first.org
  • NIST NVDVulnerability recordCVE-2026-42512

    As dhclient is building an environment to pass to dhclient-script, it may need to resize the array of string pointers. The code which expands the array incorrectly calculates its new size when requesting memory, resulting in a heap buffer overrun. A specially crafted packet can

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.